CCL: Carbocation calculations, an approach

[Miguel Quiliano Meza <rifaximina#%#gmail.com>]

 Dear colleagues.

My apologies if I disturb you with a couple of
 questions.

I have never worked with carbocations, but now I have a good
 case to start

I would like to answer some chemicals questions using
 computational chemistry, but unfortunately I obtained rare energy values.
 
Could you tell me please, what should I do? or what kind of chemistry model
 should I use?. 

I want to answer some questions:

*Which reaction
 is the most probable to happen?
*What energy is necessary to
  reach transitional compounds before obtained products?

I have performed
 some calculations using this:

#
  opt=tight freq b3lyp/6-31+g scf=qc  with the respect spin multiplicity,
  but my calculations told me that compound A is most stable than B,
 besides compound C
  is most stable than A and B. I stopped here because I think that is
 impossible.

A: is a carbocation very similar in structure like
 B
 B is not a carbocation
C is a carbocation product of
 A+B

Final energy for A = -195.60813

 Final energy for B = -195.27260

 Final energy for C = -390.92315

Thank in advance for your time. Maybe if
 you don´t have time please recommen me one good paper or good
 tutorial.

Best regards.
Miguel.